[TechAssist] Re: Hitachi 50ux27 tip of the day
- From: Kevin <kevintv@xxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 08 Mar 2005 15:25:14 -0800
I think its mostly just the power switch.
Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Phil Bader
Sent: Tuesday, March 08, 2005 3:20 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Hitachi 50ux27 tip of the day
Jim, don't overcomplicate your work. I just wet my finger and kinda
probe around.Why, most of those big TVs are a loose wire or a fuse.
Phil
becyn wrote:
>Hello all,
>I didn't put this up for assistance since the problem was so hard to
>describe. Hitachi had nothing on it either.
>
>Symtom: Picture is extremely distorted with full height and width.
>The distortion looks like a power supply ripple hetrodyning with the
>picture
>signal.
>
>Diagnostic proceedure; Found that if the convergence yokes were
>disconnected
>there was a almost normal unconverged stable picture, but shifted
to
>the right.
>2) With the conv. yokes still disconnected, engage the "service button"
>on the front
>panel. Horizontal sync is lost. This is due to the DCU now being in
>control, but there
>is an H sync "disconnect" from defl.
>
>Cure: Found missing h blank pulse on connector pg pin 5 to DCU.
>In this instance the problem was traced back to a shorted zener d715 on
>the base of
>q706 (pulse inverter). Replaced with 13v 1/2 watt , full funtionality
>restored .
>
>I dare any of you anti-scope guys to try to fix something like this
>without one!!!
>
>Jim McVey
>McVey Alltronix
>327 Broadway
>Newburgh N.Y. 12550
>
>"If it doesn't play...
>CALL MCVEY !!!!!!"
>Factory authorized
>service for over 20
>major brands.
>845 561 8383
>(Last of the Mohegans)
>
>
>
>
--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
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